Each year we operate four automated weather stations, located in Hancock, Grand Marsh, Plover, and Antigo. Data from these stations is used to run predictive disease severity models to give growers the information they need to mitigate disease risk in potato production. Current P-days and DSVs can be accessed on this page.
DSVs: First, select your nearest weather station. On the chart shown, highlight the date of your last spray and note the cumulative DSVs at that point. Then subtract that number from the most recent cumulative DSV value to get the accumulated DSVs since your last spray. When this value exceeds 18, late blight management action is recommended. You can download each chart by clicking on the menu button on the upper right corner.
P-Days: Cumulative P-Day threshold is 300. Early blight management actions are recommended beyond that point.